12.2 Communication Channels: One-Way, Two-Way, Lean and Rich

Communication channels differ along two related dimensions: whether they are one-way or two-way, and whether they are lean or rich.

What makes a channel lean or rich

A channel is termed lean or rich depending on three factors:

Multiple cues is the factor most often tested. An email carries words and nothing else; a face-to-face conversation carries words, tone, facial expression, posture and immediate reaction. That is why difficult messages delivered by email land so badly — the receiver has only the words, and the words alone can support the most negative available interpretation.

Synchronous and asynchronous

Within interactivity, CM3 distinguishes:

• Synchronous — interaction can happen at the same time, is faster, dynamic
• Asynchronous — is interaction, but with responses at different times

Note that asynchronous channels are still interactive. A discussion forum where people reply over several days is genuinely two-way; it is simply slower. Asynchronous channels have a real advantage for reflectors and for people in different time zones, who can consider a response rather than having to react.

The channel spectrum

CM3 states the mapping explicitly: leaner channels are appropriate for the tell/sell approach — emails, bulletins, newsletters, broadcast-type announcements. Two-way, richer channels are required to fully engage people and have them participating, such as discussion forums, lean coffee sessions and collaborative co-design workshops.

Choosing a mix

The operative word is mix. Neither end of the spectrum is better; they do different jobs.

Lean channels are efficient and necessary. You cannot run a workshop for 3,000 people, and much change information genuinely is broadcast information — dates, availability, where to find things. Using a rich channel for simple factual content wastes everyone's time.

Rich channels are the only way to achieve certain outcomes. Genuine participation, surfacing concerns, working through resistance, co-design and building commitment all require two-way interaction with multiple cues. A programme that tries to achieve engagement through newsletters has chosen a channel that cannot do the job, however well written.

The practical failure mode is using lean channels for rich purposes because they are cheaper and easier to evidence. "We sent twelve communications" is measurable; "we changed how people feel about this" is not, and the measurable activity displaces the effective one.

Matching channel to message

A workable set of rules:

The rule about bad news is worth stating plainly. A restructure announced to affected staff by all-staff email removes every cue that would let people read the intent, gives them no route to ask the question they urgently need answered, and signals that the sender did not want to face them. The cost in trust exceeds anything saved in effort.

One-way and two-way

Richness and directionality are related but not identical. A channel can be rich and still one-way — a well-produced video message carries tone, expression and visuals but offers no route to reply. A channel can be lean and two-way — a comment thread on an intranet post is words only, but it is interactive.

The practical consequence is that adding interactivity is often cheaper than adding richness. A written update that ends with a named person and a real invitation to reply, where replies are genuinely read and answered, converts a one-way lean channel into a two-way one at almost no cost. Given that the fourth purpose of communication planning is checking how communication is being received, the cheapest available upgrade to most change communication plans is a working return path.

Sequencing channels

Channel choice is not a single decision per message; it is usually a sequence. A well-handled significant announcement typically runs:

1. Brief line leaders first, richly and in person, so they can answer questions rather than broadcast doubt
2. Deliver the announcement synchronously where the audience size allows, so people hear it directly and can react
3. Follow immediately with a lean written record, so the facts are available to re-read and cannot drift
4. Open a two-way route — sessions, forums, or a named contact — for the questions that surface after people have absorbed it
5. Return through rich channels for the groups whose impact is greatest

Getting the order wrong is more damaging than getting any single channel wrong. Publishing the written record before line leaders are briefed is the most common sequencing error, and it puts middle managers in the position of hearing about their own team's change at the same moment their team does.